US11122547B2 - System and method for allowing cooperation between a plurality of radio nodes in a telecommunication network - Google Patents
System and method for allowing cooperation between a plurality of radio nodes in a telecommunication network Download PDFInfo
- Publication number
- US11122547B2 US11122547B2 US15/781,903 US201515781903A US11122547B2 US 11122547 B2 US11122547 B2 US 11122547B2 US 201515781903 A US201515781903 A US 201515781903A US 11122547 B2 US11122547 B2 US 11122547B2
- Authority
- US
- United States
- Prior art keywords
- cluster
- signals
- central unit
- remote unit
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
Images
Classifications
-
- H04W72/0406—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
-
- H04W72/0426—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/22—Interfaces between hierarchically similar devices between access point controllers
Definitions
- the present invention relates to telecommunication systems and methods for managing thereof.
- embodiments of the present invention relate to radio access systems in mobile networks and methods for managing thereof.
- embodiments of the present invention refer to radio access networks employing cloud architectures, such as for example Cloud (or Centralized) Radio Access Network, C-RAN, architecture.
- cloud architectures such as for example Cloud (or Centralized) Radio Access Network, C-RAN, architecture.
- Radio access networks employing cloud architectures offer an improved efficiency and management of network resources from the point of view of both hardware equipment and radio signal resources exploited for providing communication to user equipment.
- cloud architectures comprise one or more Central Units, or CUs, each of which is connected to a plurality of radio nodes or Remote Units, or RUs, preferably by means of a fiber optic cable, or fiber link.
- the CUs are connected to the core network of a mobile telecommunication network.
- the CU performs the signal processing operations of a traditional base station, or BS, equipment including signal processing at higher layer protocols (RRC/RLC/MAC) and preferably at the physical layer (L1) up to the generation of a digital baseband signal (for this reason the CU is also denoted as BaseBand Unit, or BBU).
- RRC/RLC/MAC higher layer protocols
- L1 physical layer
- the digital baseband signal is converted from electric signal to optical signal, or E/O conversion, and transmitted over the fiber link to a RU selected to radiate a radiofrequency signal based on the digital baseband signal (for this reason the RUs are also denoted as Remote Radio Head, or RRH).
- a RU selected to radiate a radiofrequency signal based on the digital baseband signal for this reason the RUs are also denoted as Remote Radio Head, or RRH).
- the composite baseband signal that is first converted from optical signal to electric signal, or O/E conversion.
- the signal is then filtered by a front-end module, converted from digital to an analog signal, or D/A conversion, up-converted from baseband to radiofrequency, or RF conversion, amplified by a power amplifier and radiated by the antennas of the selected RU.
- a RU receives analog radiofrequency signals transmitted by a user equipment, down-converts such radiofrequency signals into digital baseband signals and subject them to a E/O conversion before transmitting them to the central unit through a fronthaul link.
- a fronthaul link is based on a physical connection (even though fronthaul links based on radio communication are not excluded), for example comprising fiber optic cables, also indicated as fiber links.
- cloud architecture may envisage that the signal processing at the physical layer is shared between CU and RUs, or that all signal processing at the physical layer is performed by RUs, while the higher layer protocols are processed in the CU.
- further cloud architectures may envisage that even some functionalities of the higher level protocols, such as data link layer (L2) is processed by RUs while the remaining functionalities of the higher level protocols are processed by the CU.
- L2 data link layer
- the digital interface between CU and RU implements different protocols and/or requires different bandwidths.
- a set of RUs may be managed according to operating schemes and/or algorithms and is generally indicated as Coordinated MultiPoint, or CoMP, set.
- the CoMP set encompasses the plurality of RUs connected to a common CU to obtain an improvement of the Quality of Service, or QoS, both in downlink and in uplink.
- a CoMP set may implement a joint processing of the RUs signals, conveniently serving users equipment by a plurality of nodes of the mobile telecommunication network (i.e. RUs in C-RAN) instead of one node of the mobile telecommunication network as in a classical mobile telecommunication network architecture.
- a benefit of implementing a CoMP set is particularly relevant for those users equipment located at the edge of an area, or cell, served by a RU. Indeed, in traditional RAN architectures, communication of users equipment located at cell edges are subjected to ‘border effect’, i.e. high interferences, due to communication of user equipment in neighboring cells, with a consequent poor quality of experience for the user (i.e., low QoS). On the contrary, by implementing a CoMP set, RUs managing communication in neighboring cells coordinate signal transmission in order to reduce interferences.
- CA technique comprises transmitting signals at a same time by using different portions (e.g., in 800 MHz and 1800 MHz bands for the case of LTE) of an available spectrum.
- a RUs cluster comprise a number of RUs (which may vary from two up to hundreds RUs) limited by a plurality of factors such as for example technical and/or computational constraints in the CU, the distance between CU and RUs in terms of physical length of the connection (i.e., of the fiber link) and/or functional split implemented.
- International patent application WO 2013/163597 discloses a method for operating an interference coordinating entity (ICE) that includes partitioning, by the ICE, a cloud radio access network (CRAN) cluster by grouping transmission points serving user equipment in accordance with a partitioning criterion into at least one virtual transmission point (V-TP) to produce a V-TP set.
- UE to be served are preferably offset from a V-TP boundary.
- the method also includes saving, by the ICE, V-TP information to a memory.
- U.S. Pat. No. 8,908,602 discloses a mobile communication system that includes a plurality of remote radio heads configured to transmit a signal to user equipment and configure an antenna network and a centralized baseband pool configured to be connected to the antenna network.
- the centralized baseband pool performs clustering with respect to the plurality of remote radio heads so as to dynamically vary the number of the remote radio heads each included in a plurality of clusters.
- the Applicant has observed that in known mobile telecommunication networks based on cloud architectures substantial inter cluster interferences may arise. Particularly, border effects may occur at the boundaries between different clusters, thus reducing a quality of service and/or a quality of experience for user equipment that happen to communicate along cluster boundaries.
- the Applicant has found that is possible to lower, or even suppress, border effects at the boundaries of neighboring clusters by implementing interferences control/suppression schemes among RUs of different clusters.
- the Applicant has found that is possible to reduce border effects at boundaries of neighboring clusters by exchanging and/or sharing radio resources pooled at a certain time in a single CU among two or more CUs.
- the exchanging and/or sharing of information and radio resources among two or more CUs managing neighboring clusters enables the RUs of the clusters, especially RUs at clusters borders, to be conveniently managed by more than a single CU. This results in an improved and shared provision of service to user equipment located near the borders of neighboring clusters.
- one aspect of the present invention proposes a mobile telecommunication network comprising a plurality of network elements, the network elements being divided in at least two clusters.
- Each cluster comprises: a plurality of remote units corresponding to network elements, each remote unit being arranged for exchanging radiofrequency signals with user equipment located within at least one respective served area; a central unit corresponding to a network element arranged for managing the exchange of radiofrequency signals with the user equipment located within the served areas of each remote unit of the cluster, and a plurality of connections, each for operatively connecting a remote unit with the central unit of the same cluster.
- At least one remote unit of a first cluster is further connected to a central unit of the second cluster, at least one respective served area of the at least one remote unit of the first cluster being adjacent to at least one further respective served area of a further remote unit of the second cluster, thereby allowing both the central unit of the first cluster and the central unit of the second cluster to manage communication with user equipment through the at least one remote unit.
- the at least one remote unit of the first cluster is further connected to the central unit of a second cluster by means of a direct connection.
- the direct connection comprises an optical fiber cable.
- the central unit of the first cluster and the central unit of the second cluster are configured for exchanging coordination information through the direct connection connecting the central unit of the second cluster with the at least one remote unit, the at least one remote unit, and the connection operatively connecting the at least one remote unit with the central unit of the first cluster.
- the central unit of the first cluster is connected to the central unit of the second cluster by means of a further direct connection.
- the central unit of the first cluster and the central unit of the second cluster are configured for exchanging coordination information through the further direct connection.
- the at least one remote unit of the first cluster of the at least two clusters is further connected to the central unit of the second cluster through a respective connection operatively connecting the at least one remote unit with the central unit of the first cluster, the central unit of the first cluster, and the further direct connection connecting the central unit of first cluster with the central unit of the second cluster.
- the remote units of the a plurality of remote units are arranged for exchanging radiofrequency signals at two frequency layers of which a first frequency layer comprises a corresponding first frequency range lower than a second frequency range of a second frequency layer.
- the central unit of the first cluster and the central unit of the second cluster manage the least one remote unit for exchanging radiofrequency signals at both the first frequency layer and the second frequency layer.
- the network element comprises at least one radio head transceiver arranged for generating and radiating radiofrequency signals to user equipment located within at least one served area, and a coordinating member connected to at least two further network elements for receiving operating signals therefrom, and connected to the at least one radio head transceiver for providing processed signals thereto, based on the received operating signals.
- the radiofrequency signals are generated by the at least one radio head transceiver based on the processed signals.
- operating signals received from the at least two further network elements comprise signals in the time domain.
- the coordinating member comprises a signal selection module configured for selecting signals received from a first further network element or from a second further network element of the at least two further network elements as processed signals to be provided to the at least one radio head transceiver.
- the at least one radio head transceiver is arranged for receiving radiofrequency signals and converting the radiofrequency signals into down-converted signals.
- the coordinating member comprises a signal routing module configured for receiving the signals in the time domain from the at least one radio head transceiver and providing each signal in the time domain to the first further network element or to the second further network element.
- operating signals received from the at least two further network elements comprise signals in the frequency domain.
- the coordinating member comprises a signals addition module configured for adding the signals in the frequency domain in a processed signal to be provided to the at least one radio head transceiver.
- the at least one radio head transceiver is arranged for receiving radiofrequency signals and converting the radiofrequency signals into corresponding down-converted signals.
- the coordinating member comprises a signal de-multiplexer module configured for receiving the down-converted signals from the at least one radio head transceiver and decomposing each down-converted signal in corresponding signals in the frequency domain and providing each signal in the frequency domain to the first further network element or to the second further network element.
- operating signals received from the at least two further network elements comprise resource blocks.
- the coordinating member comprises a resource blocks combining module configured for combining resource blocks in a processed signal to be provided to the at least one radio head transceiver.
- the at least one radio head transceiver is arranged for receiving radiofrequency signals and converting the radiofrequency signals in corresponding signals.
- the coordinating member comprises a resource block de-multiplexer module configured for receiving the signals from the at least one radio head transceiver and decomposing each signal in corresponding resource blocks and providing each resource block to the first further network element or to the second further network element of the at least two further network elements.
- Another aspect of the present invention proposes a method of managing network elements of a telecommunication network.
- the network elements are divided in at least two clusters, each cluster comprises: a plurality of remote units corresponding to network elements arranged for exchanging radiofrequency signals with user equipment located within at least one respective served area, and a central unit corresponding to a network element arranged for managing the exchanging radiofrequency signals with the user equipment located within the served areas of each remote unit of the cluster.
- the method comprises: receiving, at an at least one remote unit, operating signals from a first central unit of a first cluster and from a second central unit of a second cluster; processing, at the at least one remote unit, said operating signals from the first central unit and from the second central unit for providing at least one corresponding radio frequency signal, and radiating, at the at least one remote unit, the at least one corresponding radiofrequency signals over the at least one respective served area.
- the method further comprises having the first central unit of the first cluster and the second central unit of the second cluster exchanging respective signals management information.
- the method further comprises also having both the first central unit of the first cluster and the second central unit of the second cluster generating the operating signals on the basis of the exchanged signals management information in order to reduce interference between at least one corresponding radiofrequency signals radiated by the at least one remote unit of the first cluster and radiofrequency signals radiated by a further remote unit of the second cluster.
- at least one respective served area of the at least one remote unit of the first cluster is adjacent to at least one further respective served area of the further remote unit of the second cluster.
- signals management information comprises scheduling grants and/or interference measurements referred to radiofrequency signals exchanged with user equipment within the at least one respective served area and the at least one further respective served area.
- FIG. 1 is a schematic representation of two neighboring clusters of a mobile telecommunication network implementing a cloud architecture according to an embodiment of the invention
- FIG. 2 is a schematic representation of a scenario in which remote units of neighboring clusters interact in order to provide services to user equipment;
- FIG. 3 is a schematic representation of portions of two neighboring clusters capable of implementing a cooperative carrier aggregation
- FIG. 4 is a schematic block diagram of a first structure of a remote unit connected with two central units of neighboring clusters according to an embodiment of the invention
- FIG. 5 is a schematic block diagram of a second structure of a remote unit connected with two central units of neighboring clusters according to another embodiment of the invention.
- FIG. 6 is a schematic block diagram of a third structure of a remote unit connected with two central units of neighboring clusters according to yet another embodiment of the invention.
- FIG. 7 is a schematic block diagram of an alternative structure of a fronthaul link connecting a remote unit with two central units of neighboring clusters according to an alternative embodiment of the invention.
- FIG. 1 is a schematic representation of two neighboring clusters A and B of network elements of a mobile telecommunication network 100 (e.g., a Long Term Evolution/Long Term Evolution—Advanced, LTE/LTE-A mobile telecommunication network) implementing a cloud architecture according to an embodiment of the invention.
- a mobile telecommunication network 100 e.g., a Long Term Evolution/Long Term Evolution—Advanced, LTE/LTE-A mobile telecommunication network
- LTE/LTE-A mobile telecommunication network e.g., a Long Term Evolution/Long Term Evolution—Advanced, LTE/LTE-A mobile telecommunication network
- Each cluster A and B comprise a central network element or Central Unit (CU) CUa and CUb, respectively, and a plurality of remote network elements (seven in the example of FIG. 1 ) or Remote Units (RU) RUa 1-7 and RUb 1-7 , respectively.
- CU Central Unit
- RU Remote Unit
- Central units CUa and CUb and remote units RUa 1-7 and RUb 1-7 provide communications to (i.e., serve) one or more user equipment (e.g., cellular telephones, smartphones, tablets, and generally any devices comprising networking equipment capable of connecting to a mobile telecommunication network, not shown in FIG. 1 ) over a predetermined geographic region.
- user equipment e.g., cellular telephones, smartphones, tablets, and generally any devices comprising networking equipment capable of connecting to a mobile telecommunication network, not shown in FIG. 1
- each remote unit RUa 1-7 and RUb 1-7 provides communications over one or more (e.g., three) served areas, or cells 105 (depicted as hexagons in FIG. 1 ).
- Each central unit CUa and CUb is connected to remote units RUa 1-7 or RUb 1-7 of the respective cluster A or B by means of a corresponding so-called ‘fronthaul link’ 110 a 1-6 or 110 b 1-6 (the fronthaul link connecting central unit CUa and CUb to remote unit RUa 7 and RUb 7 , respectively, is not shown in FIG. 1 for the sake of simplicity).
- fronthaul links 110 a 1-6 and 110 b 1-6 are physical connections (even though fronthaul links based on radio communication are not excluded), for example comprising fiber optic cables, also indicated as fiber links.
- each central unit CUa and CUb is connected to a core network (not shown) of the mobile telecommunication network 100 .
- Each central unit CUa and CUb manages communications occurring among remote units RUa 1-7 or RUb 1-7 and user equipment within the cells 105 by exchanging data through the fronthaul links 110 a 1-6 and 110 b 1-6 .
- the central units CUa and CUb perform the signal processing operations including operations at the higher ISO-OSI layer protocols (RRC/RLC/MAC).
- RRC/RLC/MAC ISO-OSI layer protocols
- central units CUa and CUb also perform signal processing operations at the physical layer (L1), thus generating digital baseband signals to be transmitted to user equipment (for this reason the central units CUa and CUb are also denoted as BaseBand Units, or BBUs) through remote units RUa 1-7 or RUb 1-7 serving the cells 105 where the user equipment are located.
- BBUs BaseBand Units
- Central units CUa and CUb convert each generic digital baseband signal from an electric signal to an optical signal (process indicated as ‘E/O conversion’), and transmit the optical signal over a fronthaul link 110 a 1-6 or 110 b 1-6 connected to a selected remote units RUa 1-7 or RUb 1-7 serving a cell 105 in which the user equipment recipient of the digital baseband signal is located.
- baseband signal is first converted from an optical signal to an electric signal (process indicated as ‘O/E conversion’).
- the baseband signal is then filtered, converted from a digital signal to an analog signal (process indicated as ‘D/A conversion’), up-converted from baseband to radiofrequency, amplified and finally radiated (for this reason the remote units RUa 1-7 or RUb 1-7 are also denoted as Remote Radio Heads, or RRHs) in the served cell 105 where the recipient user equipment is located.
- RRHs Remote Radio Heads
- a radiofrequency signal from a sender user equipment is received by the remote unit RUa 1-7 or RUb 1-7 serving the cell 105 where the sender user equipment is located, amplified, down-converted, converted from an analog signal to a digital signal (process indicated as ‘A/D conversion’), filtered, converted from an electric signal to an optical signal (process indicated as ‘E/O conversion’) and sent to the central unit CUa and CUb that performs signal processing operations at the physical layer (L1) and at the higher ISO-OSI layer protocols (RRC/RLC/MAC).
- L1 physical layer
- RRC/RLC/MAC ISO-OSI layer protocols
- remote units RUa 4 and RUa 5 of cluster A serve respective cells, border cells 105 na in the following, which are adjacent to border cells 105 nb served by remote units RUb 1 and RUb 2 of cluster B.
- remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 serving border cells 105 na and 105 nb , respectively, indicated as border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 in the following, are also connected to the central unit CUb and CUa, respectively, of the neighboring cluster B and A in addition to being connected to the central unit CUa and CUb of the respective cluster A and B.
- border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 are connected to the central unit CUb and CUa, respectively, of the neighboring cluster B and A by means of a direct connection.
- a ‘direct connection’ is to be intended, in general, as a fast permanent connection, for example a point-to-point connection or a connection involving other nodes.
- border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 may be connected by means of respective additional fronthaul links to the to the central unit CUb and CUa of the neighboring cluster B and A, such as for example an additional fronthaul link 115 ab connecting remote unit RUa 4 to the central unit CUb and an additional fronthaul link 115 ba connecting remote unit RUb 1 to the central unit CUa shown in FIG. 1 (as dash-dot lines).
- border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 with both the central units CUa and CUb allows the central units CUa and CUb managing in a coordinated manner the operations of border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 both belonging to their cluster A and B, respectively, and belonging to neighboring clusters A and B.
- the central units CUa and CUb manage an exchange of radiofrequency signals among border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 and user equipment located within the border cells 105 na and 105 nb.
- border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 with both the central units CUa and CUb allows a shared and coordinated management of radio resources within the border cells 105 na and 105 nb , thus abating interference issues in the border cells 105 nb caused by signals transmitted by border remote units RUa 4 and RUa 5 and/or user equipment served by them towards signals transmitted by border remote units RUb 1 and RUb 2 and/or user equipment served by them and, vice versa, interference issues in the border cells 105 na caused by signals transmitted by border remote units RUb 1 and RUb 2 and/or user equipment served by them towards signals transmitted by border remote units RUa 4 and RUa 5 .
- embodiments of the invention envisage additional fronthaul links connecting bordering remote units with central units belonging to more than two neighboring clusters of a mobile telecommunication network.
- each border remote unit is advantageously connected to the central units of any neighboring clusters of a mobile telecommunication network.
- Each border remote unit is connected with central units of neighboring clusters having at least one border cell adjacent to at least one border cell served by the border remote unit.
- the provisioning of services to user equipment in the border cells may be managed (as described in the following) by two or more (at most all) the central units of such neighboring clusters.
- the direct connection between a generic border remote unit and central units of neighboring clusters allows the central units of neighboring clusters to manage communication, i.e. an exchange of data and service and/or control signaling, through the border remote unit together with the central unit of the cluster to which the generic border remote unit belongs.
- FIG. 2 is a schematic representation of a scenario in which remote units RUa 4 and RUb 1 of neighboring clusters A and B cooperate in order to provide services to user equipment 205 a and 205 b.
- border remote units such as for example border remote units RUa 4 and RUb 1 shown in FIG. 2 , can sense signals from, and transmit signals, beyond the respective served cells 105 of the respective clusters A and B.
- radio signals transmitted by border remote unit RUa 4 of cluster A may reach at least part of border cells 105 nb served by border remote unit RUb 1 of cluster B and signal transmitted by a user equipment 205 b within cell 105 nb may be received by border remote unit RUa 4 .
- radio signals transmitted by border remote unit RUb 1 of cluster B may reach at least part of border cells 105 na served by border remote unit RUa 4 of cluster A and signal transmitted by a user equipment 205 a within cell 105 na may be received by border remote unit RUb 1 .
- any one of border remote units such as for example border remote units RUa 4 and RUb 1 may be exploited for serving user equipment 205 a and 205 b within one or more adjacent border cells 105 na and 105 nb regardless of the clusters A or B to which border remote units RUa 4 and RUb 1 , and border cells 105 na and 105 nb belong.
- the central units CUa and CUb may implement a coordinated management of the border remote units RUa 4 and RUa 1 .
- central unit CUa of cluster A may select to send, through the fronthaul link 115 ba , one or more baseband signals to the border remote unit RUb 1 of cluster B for being transmitted as corresponding radiofrequency signals to the user equipment 205 a located in the border cell 105 na , by which they are received in addition, or in alternative, to other radiofrequency signals transmitted by the remote unit RUa 4 that are based on baseband signals received from the central unit CUa of cluster A.
- the border remote unit RUb 1 of cluster B receives radiofrequency signals transmitted by the user equipment 205 a and, in its turn, transmits corresponding baseband signals to the central unit CUa of cluster A, where they are received in addition, or in alternative, to baseband signals transmitted by the remote unit RUa 4 that are based on radiofrequency signals transmitted by the same user equipment 205 a.
- central unit CUb of cluster B may select to send, through the fronthaul link 115 ab , one or more baseband signals to the border remote unit RUa 4 of cluster A for being transmitted as corresponding radiofrequency signals to the user equipment 205 b located in the border cell 105 nb , by which they are received in addition, or in alternative, to other radiofrequency signals transmitted by the remote unit RUb 1 that are based on baseband signals received from the central unit CUb of cluster B.
- the border remote unit RUa 4 of cluster A receives radiofrequency signals transmitted by the user equipment 205 b and, in its turn, transmits corresponding baseband signals to the central unit CUb of cluster B, where they are received in addition, or in alternative, to baseband signals transmitted by the remote unit RUb 1 that are based on radiofrequency signals transmitted by the same user equipment 205 b.
- the selection of which border remote unit, between remote units RUa 4 and RUb 1 , is exploited for radiating radiofrequency signals to the user equipment 205 a and 205 b , in LTE/LTE-A mobile telecommunication network 100 may be based on feedbacks from the user equipment 205 a and 205 b related to Cell Reference Signals (CRS) or other kind of Reference Signals, like e.g. the CSI-RS defined in LTE specifically for supporting CoMP.
- CRS Cell Reference Signals
- User equipment 205 a and 205 b receive Cell Reference Signals from remote units RUa 4 and RUb 1 and exploit them for estimating the channel state over the entire bandwidth provided by the remote units RUa 4 and RUb 1 for communications over the corresponding cell.
- the additional fronthaul links 115 ab and 115 ba may be used to provide a connection between central units CUa and CUb of the neighboring clusters A and B.
- the connection may be exploited by the central units CUa and CUb for exchanging signals management information (e.g., PHY, MAC, RRC protocol layer information, such as for example scheduling grants, interference measurements, etc.) in order to manage the provision of services to user equipment 205 a and 205 b within the border cells 105 na and 105 nb in such a way to effectively implementing procedures capable of reducing ‘inter-cluster’ interferences and improving a Quality of Service (QoS) and/or a Quality of Experience (QoE) for the user equipment 205 a and 205 b.
- signals management information e.g., PHY, MAC, RRC protocol layer information, such as for example scheduling grants, interference measurements, etc.
- QoS Quality of Service
- QoE Quality of Experience
- a physical link (e.g., implemented with a dedicated optical fiber cable) may be provided for connecting central units CUa and CUb in order to exchange signals management information.
- the clusters could be also partially and/or completely overlapped one another, such as for example in the case of a Heterogeneous Network 200 (HetNet) as shown for example in FIG. 3A .
- HetNet Heterogeneous Network 200
- small cells 105 s (e.g., micro-cells, pico-cells, etc.) served by a clusters of network elements, i.e. central unit sCU and remote units sRU 1-5 , forming a small cells cluster S, are overlapped by one or more larger cells, or macro-cells such as the macro-cell 105 m in FIG. 3A , served by different network elements, i.e. one or more remote units, such as the remote unit mRU 1 shown in FIG. 3A , managed by a respective central unit mCU of a respective macro-cells cluster M.
- remote units sRU 1-5 serving the small cells 105 s may be connected to the central unit mCU (which manages the operation of the remote unit mRU 1 serving the macro-cell 105 m superimposed to the cluster of small cells 105 s ) through respective additional fronthaul links 115 sm 1-5 , and viceversa the remote unit mRU 1 (serving the more macro-cells 105 m superimposed to the cluster of small cells 105 s ) may be connected to the central unit sCU of the cluster serving the small cells 105 s through a respective additional fronthaul link 115 ms 1 .
- the cloud architecture according to an embodiment of the invention may also implement an inter-cluster, or cooperative, Carrier Aggregation (CA).
- CA Carrier Aggregation
- FIG. 3B is a schematic representation of portions of two neighboring clusters A′ and B′ capable of implementing a cooperative carrier aggregation.
- the mobile telecommunication network 100 ′ implements radiofrequency signals transmission at two frequency layers.
- a first frequency layer is at a lower frequency range, e.g. selected in a frequency range below 1 GHz, such as for example centered at 800 MHz, while a second frequency layer is at a higher frequency range, e.g. selected in a frequency range above 1 GHz, such as for example centered at 1800 MHz.
- radiofrequency signals transmitted at the first frequency layer have a longer range than the range of radiofrequency signals transmitted at the second frequency layer (wherein the radiofrequency signals ranges are determined by a plurality of factors such as, for example, transmission power, environment condition, and receivers sensitivity, etc.).
- first frequency layer cells 105 L associated with the first frequency layer have a greater extension than second frequency layer cells 105 H associated with the second frequency layer.
- the carrier aggregation may be implemented within the area where radiofrequency signals transmitted at both frequency layers, i.e. the area where first frequency layer cells 105 L overlap the second frequency layer cells 105 H , which substantially corresponds to the second frequency layer cells 105 H .
- the border remote units RUa 1 ′ and RUb 1 ′ may be managed by both the central units CUa′ and CUb′ of the two clusters A′ and B′, respectively, in order to implement cooperative carrier aggregation in an area defined by second frequency layers border cells 105 Hna and 105 Hnb .
- the central units CUa′ and CUb′ may implement a cooperative carrier aggregation by exchanging scheduling information in order to achieve a coordinated scheduling of communications at both the first frequency layer and the second frequency layer in the area defined by second frequency layers border cells 105 Hna and 105 Hnb .
- cooperative carrier aggregation allows enlarging a geographic area where carrier aggregation is implemented. Indeed, cooperative carrier aggregation may extend seamlessly between neighboring clusters A′ and B′, particularly over the area defined by second frequency layers border cells 105 Hna and 105 Hnb .
- the cooperative carrier aggregation may extend seamlessly over second frequency layers border cells, such as the second frequency layers border cell 105 Hna in FIG. 3B , which overlap border first frequency layer cells of different clusters, such as for example the first frequency border layer cell 105 Lna of the cluster A′ and the first frequency border layer cells 105 Lnb of the neighboring cluster B′ in FIG. 3B (which are overlapped by the second frequency layers border cell 105 Hna ).
- central units CUa and CUb may both manage radio resources of the border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 thanks to the additional fronthaul links 115 ab and 115 ba .
- a shared scheduling procedure (for example, operated by one or more algorithms instantiated in central units CUa and CUb) may be exploited for managing radio resources between clusters A and B in order to avoid allocation of colliding and/or superimposed radio resources within the border cells 105 na and 105 nb served by the border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 .
- border remote units of neighboring clusters such as border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 of clusters A and B in FIG. 1 , implement additional functionalities with respect to known remote units in order to be managed by more than one central unit, such as the central units CUa and CUb in FIG. 1 , through the respective additional fronthaul links, such as the additional fronthaul links 115 ab and 115 ba in FIG. 1 .
- Functionalities implemented by border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 depends on how the sharing of radio resources is implemented by the central units CUa and CUb and on a functionality split implemented between a central unit and remote units connected thereto.
- FIG. 4 is a schematic block diagram of a first structure of the border remote unit RUa 4 , connected with two central units CUa and CUb of neighboring clusters A and B according to an embodiment of the invention.
- border remote unit RUa 4 described in the following might apply to any other border remote units RUa 5 , RUb 1 and RUb 2 .
- Border remote unit RUa 4 comprises a plurality of radio head transceivers 401 n (1 ⁇ n ⁇ N, where N is a positive integer).
- Each radio head transceiver 401 n comprises an antenna 405 n for radiating radiofrequency signals.
- Each antenna 405 n is coupled with a RF module 410 n arranged for performing signals RF conversion in DL, signals down-conversion in uplink and signals amplification both in downlink and in uplink.
- Each RF module 410 n is coupled with a digital to analog and analog to digital converter, or D/A-A/D converter 415 n , arranged for performing D/A conversion in downlink and A/D conversion in uplink.
- Each D/A-A/D converter 415 n is coupled with a front-end module 420 n for being filtered both in downlink and in uplink.
- the border remote unit RUa 4 comprises a first coordinating member 424 .
- the first coordinating member 424 comprises a signal selection module 425 coupled with each front-end module 420 n of the radio head transceiver 401 n .
- the signal selection module 425 is arranged for receiving operating signals, such as for example baseband signals, provided by the two central units CUa and CUb and providing a processed signal (e.g., routing a selected baseband signal) to a selected radio head transceiver 401 n.
- the signal selection module 425 is coupled with a first optical-electric and electro-optical signal converter, or first O/E-E/O converter 430 a and to a second O/E-E/O converter 430 b .
- the first O/E-E/O converter 430 a is connected to the fronthaul link 110 a 4 that connects the remote unit RUa 4 to the central unit CUa of cluster A for exchanging (optical) operating signals with the central unit CUa.
- the second O/E-E/O converter 430 b is connected to the additional fronthaul link 115 ab that connects the border remote unit RUa 4 to the central unit CUb of cluster B for exchanging (optical) operating signals with the central unit CUb.
- border remote unit RUa 4 comprises a signal routing module 435 coupled with each front-end module 420 n of the radio head transceiver 401 n .
- the signal routing module 435 is arranged for receiving baseband signal based on down-converted radiofrequency signals received by radio head transceiver 401 n (e.g., transmitted by user equipment 205 a and 205 b ) and routed to a corresponding central unit CUa or CUb.
- the signal routing module 435 is coupled with the first O/E-E/O converter 430 a and with the second O/E-E/O converter 430 b.
- OFDMA/SC-FDMA signals in the time domain may be transmitted from/to the from the central units CUa and CUb to/from the border remote unit RUa 4 through the fronthaul link 110 a 4 or the additional fronthaul link 115 ab , respectively, using operating signals, e.g. based on Common Public Radio Interface (CPRI) or Open Base Station Architecture Initiative (OBSAI) interfaces.
- CPRI Common Public Radio Interface
- OBSAI Open Base Station Architecture Initiative
- a scheduling procedure adapted to manage operation of central units CUa and CUb and border remote units RUa 4 , RUa 5 , RUb 1 and RUb 2 envisages, in DL, exploiting the signal selection module 425 as a switch that selects between the OFDMA signals in the time domain, i.e. baseband signals, received from the central units CUa or CUb over the fronthaul link 110 a 4 or the additional fronthaul link 115 ab , respectively.
- the selected baseband signal is then transmitted to the radio head transceiver 401 n radiating radiofrequency signals in the border cell 105 na or 105 nb (served or reached by the border remote unit RUa 4 ) where the recipient user equipment 205 a or 205 b is located.
- the scheduling procedure envisages exploiting the signal routing module 435 for routing each down-converted radiofrequency SC-FDMA signal received by the border remote unit RUa 4 towards the corresponding central units CUa or CUb over the fronthaul link 110 a 4 or the additional fronthaul link 115 ab , respectively.
- the structure of the border remote units, such as the border remote unit RUa 4 , and the scheduling procedure according to the present invention allow the border remote units, such as the border remote unit RUa 4 , being selectively associated with different central units, such as the central units CUa and CUb.
- a control of communication over the border cells 105 na or 105 nb switches from the central unit CUa of cluster A to the central unit CUb of cluster B and vice versa depending on a spatial distribution of the network traffic.
- a spatial distribution of the traffic is evaluated based on location and movement through the border cells 105 na or 105 nb of user equipment 205 a and 205 b , number of connection requests to cluster A and to cluster B.
- control over border cells 105 na and 105 nb may be assigned to the cluster A or B that serves the larger number of user equipment in proximity of the borders of the adjacent clusters A and B.
- control over border cells 105 na and 105 nb is assigned to the cluster A or B based on a number of served user equipment as a function of time.
- a frequent switching of control from a central unit to another central unit may cause a drop of the active connections to user equipment managed by a cluster (e.g., if the control over border cell 105 na is switched from cluster A to cluster B any communication between user equipment, such as the user equipment 205 a in FIG. 2 , within border cell 105 na and managed by cluster A is interrupted), the switching of control may planned on a substantially long term basis (e.g., daily, weekly, monthly, etc.) according to communication traffic trends.
- a substantially long term basis e.g., daily, weekly, monthly, etc.
- the switching of control over border cells 105 na and/or 105 nb is planned based on an analysis of past communication traffic data.
- FIG. 5 it is a schematic block diagram of a second structure of remote unit RUa 4 connected with the two central units CUa and CUb of neighboring clusters A and B according to another embodiment of the invention.
- the second structure of remote unit RUa 4 differs from the first structure described above in what follows (wherein similar numeral references denote similar elements).
- Border remote unit RUa 4 comprises a second coordinating member 524 .
- the second coordinating member 524 comprises a signal addition module 525 coupled with each front-end module 520 n (instead of a signal selection module 425 ), and a signal de-multiplexer module 535 (instead of a signal routing module 435 ) coupled with each front-end module 520 n.
- Both the signal addition module 525 and a signal de-multiplexer module 530 are coupled with a first optical-electric and electro-optical signal converter, or first O/E-E/O converter 530 a and with a second O/E-E/O converter 530 b for exchanging (optical) operating signals with the central units CUa and CUb.
- the signal addition module 525 is arranged for receiving operating signals in e.g. CPRI format provided by the two central units CUa and CUb, combining them together in a processed signal, e.g. a composite baseband signal, and route the composite baseband signal to a selected radio head transceiver 501 n for being converted in a radiofrequency signal that is radiated by the antenna 505 n of the selected radio head transceiver 501 n.
- a processed signal e.g. a composite baseband signal
- a usage of radio resources, particularly OFDMA/SC-FDMA signals in the frequency domain, is coordinated among the central units, such as for example the central units CUa and CUb, i.e. central units CUa and CUb coordinate radio resources allocation in order to avoid overlaps among allocated radio resources in the frequency domain.
- CPRI format signals transmitted by the central units CUa and CUb are received at the signal addition module 525 where they are converted into corresponding time-domain OFDMA signals and then added together for generating the composite baseband signal.
- the addition of the OFDMA signals in the time domain creates a composite baseband signal whose spectrum is the superposition of the spectrum of the separate OFDMA signals.
- each radiofrequency signal based on the corresponding composite baseband signal radiated by the selected radio head transceiver 501 n of the border remote unit RUa 4 comprises information provided by both the central units CUa and CUb, thus enabling implementation of coordinated communication schemes for users equipment, such as the user equipment 205 a and 205 b in FIG. 2 , located at the clusters borders.
- border remote unit RUa 4 may provide communications to user equipment 205 a and 205 b managed by clusters A and B at the same time.
- the signal de-multiplexer module 535 decomposes down-converted radiofrequency signals provided by the radio head transceiver 501 n of the border remote unit RUa 4 in the corresponding time-domain SC-FDMA signals, which are then converted in CPRI format signals and sent to the corresponding recipient central unit CUa or CUb through the fronthaul link 110 a 4 or 115 ab , respectively (as optical signals converted by the O/E-E/O converters 530 a or 530 b ).
- the second structure of the border remote units such as for example border remote unit RUa 4
- the coordinated sharing procedure of radio resource in the frequency domain among the central units such as for example the central units CUa and CUb
- the second structure of the border remote units allows a real-time provisioning of services to user equipment, such as for example user equipment 205 a and 205 b , located within border cells 105 na and 105 nb served by cluster A and B, respectively, even if the communication with such user equipment is managed by a different neighboring cluster, such as cluster B or A, respectively.
- FIG. 6 is a schematic block diagram of a third structure of the border remote unit RUa 4 connected with the two central units CUa and CUb of neighboring clusters A and B according to yet another embodiment of the invention.
- border remote unit RUa 4 differs from the first and second structures described above in what follows (wherein similar numeral references denote similar elements).
- a different functional split between the central units CUa and CUb, and the border remote unit RUa 4 is considered.
- a functional split comprising a frequency domain management implemented at the border remote unit RUa 4 is considered, such as for example as taught in the International patent applications WO2010/075864 and WO2010/075865 of the same Applicant.
- the border remote unit RUa 4 is arranged to manage basic radio resources, i.e. (Physical) Resource Blocks or RB, allocated to each user equipment 205 a and 205 b to be served.
- basic radio resources i.e. (Physical) Resource Blocks or RB
- each radio head transceiver 601 n of the border remote unit RUa 4 further comprises a Cyclic Prefix, or CP insertion/extraction module 625 n coupled with the front end module 620 n and a Fast Fourier Transform/Inverse Fast Fourier Transform, or FFT/IFFT module 635 n coupled with the CP insertion/extraction module 625 n.
- the border remote unit RUa 4 comprises a third coordinating member 639 .
- the third coordinating member 639 comprises a Resource Block, or RB combination module 640 and a RB de-multiplexer module 645 both connected to the FFT/IFFT module 635 n of each radio head transceiver 601 n of the border remote unit RUa 4 for providing processed signals thereto.
- Both the RB combination module 640 and the RB de-multiplexer module 645 are further coupled with a first O/E-E/O converter 630 a and with a second O/E-E/O converter 630 b for exchanging (optical) operating signals with the central units CUa and CUb, respectively.
- the third structure of the border remote unit RUa 4 allows implementing more sophisticated signal processing algorithms at the border remote unit RUa 4 with respect to the first and second structures described above.
- the RB combination module 640 composes combined OFDMA signals based on resource blocks received from both the central units CUa and CUb creating a combined signal in the frequency domain.
- each combined OFDMA signal is passed to the FFT/IFFT module 635 n and therefrom to the CP insertion module 625 n that generate a corresponding baseband signal, which is in its turn sequentially processed by the front end module 620 n , the D/A converter 615 n , and the RF module 610 n thus being converted in a radiofrequency signal that is radiated by the antenna 605 n.
- a usage of radio resources is coordinated among the central units, such as for example the central units CUa and CUb (i.e. the central units CUa and CUb allocate resources blocks in a non-conflicting manner).
- the RB de-multiplexer module 645 decomposes SC-FDMA signals provided by the radio head transceivers 601 n of the border remote unit RUa 4 in the constituting resource blocks which are converted in the CPRI format and sent to the corresponding recipient central unit CUa or CUb through the fronthaul link 110 a 4 or 115 ab , respectively, as optical signals (converted by the O/E-E/O converters 630 a or 630 b ).
- the third structure of the border remote units such as for example border remote unit RUa 4 , and the coordinated allocation procedure of resource blocks among the central units, such as for example the central units CUa and CUb, according to an embodiment of the invention allows a real-time provisioning of services to user equipment, such as for example user equipment 205 a and 205 b , located within border cells 105 na and 105 nb even if such user equipment are served by different neighboring clusters, such as clusters A and B.
- user equipment such as for example user equipment 205 a and 205 b
- the third structure of the border remote unit RUa 4 and the coordinated allocation procedure of the central units CUa and CUb performed with RB resolution allows a highly precise and effective shared management of radio resources within the border cells 105 na and 105 nb.
- FIG. 7 is a schematic block diagram of an alternative structure of fronthaul link connecting the border remote unit Ra 4 with the two central units CUa and CUb of neighboring clusters A and B according to an alternative embodiment of the invention.
- fronthaul link envisage a direct connection between central units CUa and CUb of neighboring clusters A and B.
- the direct connection between central units CUa and CUb may be provided by means of a CU-to-CU link 700 , such as for example a physical connection comprising an optical fiber cable (even though a wireless connection is not excluded).
- the CU-to-CU link 700 may be exploited for directly exchanging signals management information between central units CUa and CUb allowing a coordinated management of radio resources.
- the CU-to-CU link 700 are be also exploited for providing a connection between the central unit CUb and the border remote unit Ra 4 through the central unit CUa and the fronthaul link 110 a 4 . Therefore, additional fronthaul links, such as the fronthaul link 115 ab , which connect remote radio head units of a cluster with the central unit of a neighboring cluster are no longer required.
- the CU-to-CU link 700 is designed to allow exchanging signals' management information and to allow to central unit CUb to transmit the signals related with the time/frequency resources managed by the central unit CUb to the central unit CUa.
- the CU-to-CU link 700 is designed with a sufficient capacity (e.g., allowing a bit rate in the order of Gb/s) in order to transmit high data rate signals (for example CPRI format signals) comprising allocation information exchanged by the central units CUa and CUb and transmission data (e.g., baseband signals, OFDMA/SC-FDMA signals or resource blocks according to the structure of the border remote unit Ra 4 ) allocated by the central unit CUb to be converted in, or portions of, radiofrequency signals radiated by the border remote unit Ra 4 .
- a sufficient capacity e.g., allowing a bit rate in the order of Gb/s
- high data rate signals for example CPRI format signals
- transmission data e.g., baseband signals, OFDMA/SC-FDMA signals or resource blocks according to the structure of the border remote unit Ra 4
- the border remote unit Ra 4 in the example of FIG. 7 substantially has the first structure of border remote unit Ra 4 described above (apart for the absence of O/E-E/O converter 430 b that is not needed), the CU-to-CU link 700 may be implemented to operate in cluster comprising border remote units with different structures.
- border remote unit RUa 4 might be applied to any other border remote units RUa 5 , RUb 1 and RUb 2 of the mobile telecommunication network 100 .
- border remote unit Ra 4 is to be intended as non-limitative example; indeed, further different functional split (not shown) may be implemented among the central units CUa and CUb, and the border remote unit RUa 4 without departing from the scope of the present invention.
- the radio head transceivers of a generic border remote unit may be subdivided in two or more subsets, in such a way that the radio head transceivers of each subset are configured for radiating radiofrequency signals based on operating signals provided by a respective central unit connected to the border remote unit (e.g., through a corresponding additional fronthaul link).
- a generic number x (1 ⁇ x ⁇ N) of the N radio head transceivers of the border remote unit Ra 4 may be configured for radiating radiofrequency signals based on operating signals provided by the central unit CUa and the remaining N-x radio head transceivers of the border remote unit Ra 4 may be configured for radiating radiofrequency signals based on operating signals provided by the central unit CUb.
- the number of radio head transceivers assigned to each subset may be dynamically or periodically determined based on actual traffic and/or known traffic patterns in the mobile telecommunication network 100 .
- all the members and/or modules comprised in the structures of the border remote unit RUa 4 may be implemented in the border remote unit RUa 4 as hardware units, such as for example by means of one or more ad hoc circuitries (e.g., comprising electronic components such as for example one or more microprocessors, ASICs, FPGAs, microcontroller, DSPs etc.) and/or implemented as firmware/software products instantiated in processing arrangement of the border remote unit RUa 4 (e.g., a processing arrangement comprising at least one general purpose/task specific processing unit and preferably volatile and/or non-volatile memories, etc.).
- ad hoc circuitries e.g., comprising electronic components such as for example one or more microprocessors, ASICs, FPGAs, microcontroller, DSPs etc.
- firmware/software products instantiated in processing arrangement of the border remote unit RUa 4 e.g., a processing arrangement comprising at least one general purpose/task specific processing unit and preferably volatile and/
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims (19)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2015/081349 WO2017114562A1 (en) | 2015-12-29 | 2015-12-29 | System and method for allowing cooperation between a plurality of radio nodes in a telecommunication network |
Publications (2)
Publication Number | Publication Date |
---|---|
US20180359739A1 US20180359739A1 (en) | 2018-12-13 |
US11122547B2 true US11122547B2 (en) | 2021-09-14 |
Family
ID=55174605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/781,903 Active 2036-02-18 US11122547B2 (en) | 2015-12-29 | 2015-12-29 | System and method for allowing cooperation between a plurality of radio nodes in a telecommunication network |
Country Status (3)
Country | Link |
---|---|
US (1) | US11122547B2 (en) |
EP (1) | EP3398398B1 (en) |
WO (1) | WO2017114562A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112018003906T5 (en) * | 2017-07-31 | 2020-09-03 | Mavenir Networks, Inc. | Method and device for flexible division of the physical front haul layer for cloud radio access networks |
US10965654B2 (en) | 2017-11-28 | 2021-03-30 | Viavi Solutions Inc. | Cross-interface correlation of traffic |
US10560206B2 (en) | 2017-12-12 | 2020-02-11 | Viavi Solutions Inc. | Processing a beamformed radio frequency (RF) signal |
US10979326B2 (en) * | 2018-05-11 | 2021-04-13 | Viavi Solutions Inc. | Detecting interference of a beam |
US10631263B2 (en) | 2018-09-14 | 2020-04-21 | Viavi Solutions Inc. | Geolocating a user equipment |
Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120281555A1 (en) * | 2011-05-02 | 2012-11-08 | Research In Motion Limited | Systems and Methods of Wireless Communication with Remote Radio Heads |
US20120281551A1 (en) * | 2011-05-02 | 2012-11-08 | Renesas Mobile Corporation | method for setting a mobile node specific cyclic prefix in a mobile communication |
EP2525623A2 (en) | 2011-05-17 | 2012-11-21 | Huawei Technologies Co., Ltd. | Communication system and management method thereof |
US20120329498A1 (en) * | 2010-03-05 | 2012-12-27 | Lg Electronics Inc. | Apparatus and method for controlling inter-cell interference |
US20130064230A1 (en) * | 2010-04-07 | 2013-03-14 | Lg Electronics | Method of transmitting and receiving signal in a distributed antenna system |
US20130070816A1 (en) * | 2011-09-20 | 2013-03-21 | Kabushiki Kaisha Toshiba | Communication device, base station, and base station system |
US20140044054A1 (en) * | 2012-08-08 | 2014-02-13 | Joon Beom Kim | Method and system having reference signal design for new carrier types |
EP2753143A1 (en) | 2013-01-08 | 2014-07-09 | Alcatel Lucent | Apparatus, method and computer program for splitting baseband data processing between a plurality of baseband processing units |
US20140212129A1 (en) * | 2013-01-28 | 2014-07-31 | Transpacific Ip Management Group Ltd. | Remote radio header selection |
US20140342768A1 (en) * | 2012-01-02 | 2014-11-20 | Huawei Technologies Co., Ltd. | Power control in a wireless communication system |
US20150244430A1 (en) * | 2001-04-26 | 2015-08-27 | Genghiscomm Holdings, LLC | Cloud Radio Access Network |
US20150349908A1 (en) * | 2014-05-05 | 2015-12-03 | Telefonaktiebolaget L M Ericsson (Publ) | Methods providing configuration parameters for inter base station coordinated multipoint communications |
US20150358030A1 (en) * | 2013-01-16 | 2015-12-10 | Telefonaktiebolaget L M Ericsson (Publ) | Compression and De-Compression of Complex Valued OFDM Data for a Radio Base Station |
US20160119826A1 (en) * | 2013-05-10 | 2016-04-28 | Pantech Inc. | Method and device for transmitting data in wireless communication system supporting dual connectivity |
US20160192181A1 (en) * | 2013-09-10 | 2016-06-30 | Lg Electronics Inc. | Method of obtaining rru information by bbu, and bbu |
US20160278061A1 (en) * | 2015-03-17 | 2016-09-22 | Institute of Sensing Technology and Business, Beijing University of Posts and Telecommunications | Service transmission method and device |
US20170064722A1 (en) * | 2014-02-21 | 2017-03-02 | Commscope Technologies Llc | Frequency planning in a distributed antenna system |
US9924375B1 (en) * | 2015-11-02 | 2018-03-20 | Sprint Spectrum L.P. | Method and system for sharing remote radio head between cell sites |
US20180234875A1 (en) * | 2012-05-04 | 2018-08-16 | Eblink Bvba | High Efficiency Small Cell Fronthaul Systems and Methods |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180264875A1 (en) * | 2017-03-16 | 2018-09-20 | Ryan Mongan | Cosmetic Brush Cleaner and Dryer |
-
2015
- 2015-12-29 WO PCT/EP2015/081349 patent/WO2017114562A1/en active Application Filing
- 2015-12-29 EP EP15825940.8A patent/EP3398398B1/en active Active
- 2015-12-29 US US15/781,903 patent/US11122547B2/en active Active
Patent Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150244430A1 (en) * | 2001-04-26 | 2015-08-27 | Genghiscomm Holdings, LLC | Cloud Radio Access Network |
US20120329498A1 (en) * | 2010-03-05 | 2012-12-27 | Lg Electronics Inc. | Apparatus and method for controlling inter-cell interference |
US20130064230A1 (en) * | 2010-04-07 | 2013-03-14 | Lg Electronics | Method of transmitting and receiving signal in a distributed antenna system |
US20120281555A1 (en) * | 2011-05-02 | 2012-11-08 | Research In Motion Limited | Systems and Methods of Wireless Communication with Remote Radio Heads |
US20120281551A1 (en) * | 2011-05-02 | 2012-11-08 | Renesas Mobile Corporation | method for setting a mobile node specific cyclic prefix in a mobile communication |
EP2525623A2 (en) | 2011-05-17 | 2012-11-21 | Huawei Technologies Co., Ltd. | Communication system and management method thereof |
US20130017852A1 (en) | 2011-05-17 | 2013-01-17 | Huawei Technologies Co., Ltd. | Communication system and management method thereof |
US20130070816A1 (en) * | 2011-09-20 | 2013-03-21 | Kabushiki Kaisha Toshiba | Communication device, base station, and base station system |
US20140342768A1 (en) * | 2012-01-02 | 2014-11-20 | Huawei Technologies Co., Ltd. | Power control in a wireless communication system |
US20180234875A1 (en) * | 2012-05-04 | 2018-08-16 | Eblink Bvba | High Efficiency Small Cell Fronthaul Systems and Methods |
US20140044054A1 (en) * | 2012-08-08 | 2014-02-13 | Joon Beom Kim | Method and system having reference signal design for new carrier types |
EP2753143A1 (en) | 2013-01-08 | 2014-07-09 | Alcatel Lucent | Apparatus, method and computer program for splitting baseband data processing between a plurality of baseband processing units |
US20150358030A1 (en) * | 2013-01-16 | 2015-12-10 | Telefonaktiebolaget L M Ericsson (Publ) | Compression and De-Compression of Complex Valued OFDM Data for a Radio Base Station |
US20140212129A1 (en) * | 2013-01-28 | 2014-07-31 | Transpacific Ip Management Group Ltd. | Remote radio header selection |
US20160119826A1 (en) * | 2013-05-10 | 2016-04-28 | Pantech Inc. | Method and device for transmitting data in wireless communication system supporting dual connectivity |
US20160192181A1 (en) * | 2013-09-10 | 2016-06-30 | Lg Electronics Inc. | Method of obtaining rru information by bbu, and bbu |
US20170064722A1 (en) * | 2014-02-21 | 2017-03-02 | Commscope Technologies Llc | Frequency planning in a distributed antenna system |
US20150349908A1 (en) * | 2014-05-05 | 2015-12-03 | Telefonaktiebolaget L M Ericsson (Publ) | Methods providing configuration parameters for inter base station coordinated multipoint communications |
US20160278061A1 (en) * | 2015-03-17 | 2016-09-22 | Institute of Sensing Technology and Business, Beijing University of Posts and Telecommunications | Service transmission method and device |
US9924375B1 (en) * | 2015-11-02 | 2018-03-20 | Sprint Spectrum L.P. | Method and system for sharing remote radio head between cell sites |
Non-Patent Citations (2)
Title |
---|
Bhaumik, S., et al., "Breathe to Stay Cool: Adjusting Cell Sizes to Reduce Energy Consumption", Green Networking 2010, Aug. 30, 2010, New Delhi, India. (Year: 2010). * |
International Search Report and Written Opinion dated Sep. 19, 2016, in PCT/EP2015/081349 filed Dec. 29, 2015. |
Also Published As
Publication number | Publication date |
---|---|
US20180359739A1 (en) | 2018-12-13 |
EP3398398A1 (en) | 2018-11-07 |
WO2017114562A1 (en) | 2017-07-06 |
EP3398398B1 (en) | 2022-10-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10595260B2 (en) | Concept for load balancing in a radio access network | |
US11122547B2 (en) | System and method for allowing cooperation between a plurality of radio nodes in a telecommunication network | |
US8467818B2 (en) | Communication system and management method thereof | |
EP3883294B1 (en) | Small cell network architecture for servicing multiple network operations | |
KR101642214B1 (en) | ENHANCED PHYSICAL DOWNLINK CONTROL CHANNEL (ePDCCH) INTER-CELL INTERFERENCE COORDINATION (ICIC) | |
US8588803B2 (en) | Method and apparatus for resource scheduling for network controlled D2D communications | |
US9918325B2 (en) | Enhanced inter-cell interference coordination | |
EP2865209B1 (en) | Method and apparatus for dynamic cell configuration | |
US20150133099A1 (en) | Migration of a virtual access point | |
CA3084557A1 (en) | Communication method, communications apparatus and computer readable medium | |
US20190150213A1 (en) | Method for managing radio resources in communication system and apparatus for the same | |
US11323171B2 (en) | System and method for a mobile communication coverage area | |
CN110087332A (en) | Base station, user equipment and its communication means | |
US11917587B2 (en) | Supporting multi-signal source communications in a distributed communications system | |
Mastrosimone et al. | Moving network based on mmwave technology: a promising solution for 5g vehicular users | |
WO2014061345A1 (en) | Communication system, base station device and communication method | |
Kar et al. | A sneak peek into 5G communications | |
Wong et al. | Overview of new technologies for 5G systems | |
US10225821B2 (en) | Wireless communication system control of carrier aggregation for a wireless relay | |
Series | Future technology trends of terrestrial IMT systems | |
US20240155361A1 (en) | Private network | |
Jain | Wireless Networking in White Spaces |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TELECOM ITALIA S.P.A., ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOLDI, MAURO RENATO;GIANOLA, PAOLO;MELIS, BRUNO;REEL/FRAME:046003/0346 Effective date: 20160120 |
|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: ADVISORY ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: AWAITING TC RESP, ISSUE FEE PAYMENT VERIFIED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |